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SY21031 - 0.8A Asynchronous Step-Down Regulator

General Description

The SY21031 high-efficiency asynchronous stepdown DC/DC regulator is using an adaptive constant off-time architecture, and can deliver 0.8A current over a wide input voltage range from 4.5V to 55V.

It integrates a main switch with low RDS(ON) to minimize conduction loss.

Key Features

  • 4.5V to 55V Input Voltage Range.
  • Up to 0.8A Output Current.
  • Low RDS(ON) for Internal N-Channel Power FET: 700mΩ.
  • 1.2MHz Pseudoconstant Switching Frequency.
  • Adaptive Constant Off-Time Control.
  • Internal Soft-Start Limits Inrush Current.
  • ±1% 0.6V Reference.
  • Hiccup Mode Short-Circuit Protection.
  • EN On/Off Control with Accurate Threshold.
  • Cycle-by-Cycle Peak Current Limit.
  • RoHS-Compliant and Halogen-Free.
  • Compact SOT23-6 Package.

📥 Download Datasheet

Datasheet Details

Part number SY21031
Manufacturer Silergy
File Size 1.16 MB
Description 0.8A Asynchronous Step-Down Regulator
Datasheet download datasheet SY21031 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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SY21031 High-Efficiency, 1.2MHz, 55V Input, 0.8A Asynchronous Step-Down Regulator General Description The SY21031 high-efficiency asynchronous stepdown DC/DC regulator is using an adaptive constant off-time architecture, and can deliver 0.8A current over a wide input voltage range from 4.5V to 55V. It integrates a main switch with low RDS(ON) to minimize conduction loss. The 1.2MHz switching frequency permits low output-voltage ripple and reduces the external inductor and capacitor sizes. The SY21031 also provides cycle-by-cycle current limiting and hiccup short-circuit protection. The feedback resistors (RH and RL), the input capacitor CIN, the output capacitor COUT, the output inductor L, along with the freewheeling Schottky diode D1, need to be selected for the targeted application.